PAH compounds have been found in the exhaust from all types of engines burning hydrocarbon fuels. They have also been found in the air over cities and in water. The authors report on a study to assess the concentrations of twelve different PAH compounds in several different environments in dieselized underground mines. In addition, the differences in the PAH levels and distributions in different mines will be demonstrated. Finally, the influence of blasting and the type of diesel engine used...

The Volvo BM 861 U articulated truck is one of the few underground diesel units manufactured by an organization which shares the same corporate roof as the engine manufacturer. As a consequence, the unit has provided an opportunity for the characteristics of the entire system&mdash;turbocharged aftercooled engine, transmission and exhaust scrubber&mdash;to interact to minimize emission levels. The performance of the components of the system, as evaluated by full-scale dynamometer testing, is...

The use of current electronic technology in the design of new underground mine communications equipment is providing improved and expanded voice communications which can, in turn, contribute to improved productivity and safety. A review of equipment that is now available or under development includes the following categories: WIRED SYSTEMS&mdash;1. Pager phones with selective calling, audible and visual alerting and message indicator.2. Multi-conversation pager phones that use multiwire cable...

A field laboratory for use in monitoring underground mine air quality has been developed and proven in underground service. The laboratory includes two separate monitoring systems and data analysis computer programs. One is the Mine Air Monitoring Laboratory (MAML). This is an enclosed trailer-mounted laboratory capable of monitoring CO2, CO, NO, NO2, particulate matter, SO2, NH3, temperature and air velocity in the mine drift. The MAML can be up to 1000 feet away from the area being...

Grinding mill hydrostatic trunnion bearings require an external pumping source to provide and maintain the oil film between the bearing members. In order to guarantee a predetermined minimum film thickness, the lubrication system tends to be oversized. The oil film is &quot;indirectly&quot; controlled by flow, pressure and temperature monitors with fixed settings on the conservative side. This can lead to excessive maintenance and abbreviated life for the lubrication system components. A...

Continued and expanded use of underground diesel-powered equipment is considered desirable in order to achieve necessary production capability, particularly when coal becomes increasingly in demand as an energy source. Although diesel engines are derated for underground use, concern has been expressed in many quarters regarding the health effects of worker exposure to diesel-generatedpaniculate and NOx emissions. This concern will increase as Canadian diesel fuel quality becomes heavier and...

Plant owners and operators, plant designers and grinding mill manufacturers are giving much attention to the design and manufacture of autogenous and semi-autogenous grinding mills, particularly the mills that have large diameters and draw power up to 10,000 hp and greater. Reliable designs giving long operating lives are required in today's ore processing plants.This paper reviews bench-scale and pilot-plant testing to determine first if the ore is suitable to be ground by these methods and...